The Brothers' War

Argothian Opportunist | Creature | Human Scout | When Argothian Opportunist enters the battlefield, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") | Ina Wong

Burrowing Razormaw | Creature | Beast | When Burrowing Razormaw dies, mill four cards. (Put the top four cards of your library into your graveyard.) | Uriah Voth

Fog of War | Instant | | You gain 1 life for each creature on the battlefield. Prevent all combat damage that would be dealt this turn by creatures with power 3 or less. | Josu Hernaiz

Perimeter Patrol | Creature | Human Soldier | Whenever an artifact enters the battlefield under your control, Perimeter Patrol gets +1/+0 until end of turn. | Edgar Sánchez Hidalgo

Wasteful Harvest | Instant | | Mill five cards. You may put a permanent card from among the cards milled this way into your hand. (To mill a card, put the top card of your library into your graveyard.) | Alex Stone